The BK Precision 1686A DC Power Supply, 3-14V, 13.8V/12A, 120VAC Line Input is designed for continuous duty without overheating and are ideal for substituting car batteries. The 1686A uses thermostatically controlled fan cooling for improved heat dissipation and includes overvoltage protection, foldback current limiting, and reverse polarity protection. Two panel mounted meters continuously monitor the output voltage and current.